<template>
    <div style="padding: 0 5px">
        <h4>发表评论</h4>
        <hr>
        <van-cell-group>
            <van-field type="textarea" placeholder="请输入留言" v-model.trim="content"/>
        </van-cell-group>
        <van-button type="info" @click="addComment">发表评论</van-button>
        <van-list>
            <div v-for="(item,i) in commentList" :key="item.id">
                <div class="title">
                    <span>第{{i+1}}楼</span>
                    <span>用户: {{item.user_name}}</span>
                    <span>发表时间: {{item.add_time | formatDate}}</span>
                </div>
                <div class="body">{{item.content}}</div>
            </div>
        </van-list>
        <van-button plain hairline type="danger" @click="loadMore" :disabled="isDisabled">加载更多</van-button>
    </div>
</template>

<script>
    import axios from 'axios'
export default {
  props: ['artId'],
  data() {
    return {
      content: '',
      pageIndex: 1,
      commentList: [], // 评论数据
      finished: true,
      isDisabled: false
    }
  },

  created() {
    this.getCommentList() // 获取评论信息
      axios.get(`/api/getcomments/${this.artId}?pageindex=${this.pageIndex}`)
          .then(this.lL)
  },

  methods: {
    async getCommentList() {
      var { data } = await this.$http.get(
        `/api/getcomments/${this.artId}?pageindex=${this.pageIndex}`
      )
      if (data.status !== 0) {
        return this.$toast('加载评论列表失败!')
      }
      if (data.message.length === 0) {
        this.isDisabled = true
        return this.$toast('没有更多数据了')
      }
      this.commentList.push(...data.message)
        // console.log(this.commentList)
    },
    loadMore() { // 加载更多
      this.pageIndex++ // 改变页数之后，再次获取数据
      this.getCommentList()
    },
    async addComment() { // 发表评论
      if (!this.content) return this.$toast('输入内容不能为空!')

      var { data: res } = await this.$http.post(
        `/api/postcomment/${this.artId}`,
        { content: this.content }
      )
      if (res.status !== 0) {
        return this.$toast('提交评论失败!')
      }
        // 提示用户评论提交成功
      this.$toast(res.message)

      this.commentList.unshift({
        user_name: '匿名用户',
        add_time: new Date(),
        content: this.content
      })
      this.content = '' // 评论提交成功后，输入框清空数据
    }
  }
}
</script>

<style lang="less" scoped>
.van-field {
  height: 100px;
  border: 1px solid #ccc;
}
.van-button {
  width: 100%;
  margin-top: 5px;
  margin-bottom: 5px;
}
.title {
  height: 30px;
  background-color: #ccc;
  font-size: 12px;
  line-height: 30px;
  span {
    margin-right: 6px;
  }
}
.body {
  line-height: 35px;
  text-indent: 2em;
  font-size: 12px;
}
</style>
